Abstract: An integrated telephone switching apparatus interconnects a plurality a PBX's to a single voice mail system. The apparatus includes a plurality of input ports for accepting calls from the voice mail extensions of different PBX's, a plurality of output ports for directing the calls to the voice mail ports of the voice mail system, and a switching circuit for switching the calls from input ports to the output ports. An internal switching control system selectively cross-connects incoming calls from the input ports to the output ports. The control system receives call information from the PBX's via a digital data connection, or by in-band dial tones, matches each set of call information with an associated call, creates a new set of call information for each of the calls, and supplies the new set of call information to the voice mail system when the call is switched so that the voice mail system can answer the call and play the required greeting.

Abstract: An integrated telephone switching apparatus is operative for interconnecting a plurality a PBX's to a single voice mail system. The integrated switching apparatus includes a plurality of input ports for accepting calls from the voice mail extensions of different PBX's, a plurality of output ports for directing the calls to a the voice ports of a voice mail system, and a switching circuit for switching the calls from input ports to the output ports. The switching apparatus further includes a switching control system for controlling the switching of the incoming calls from the input ports to the output ports.